CVE-2021-38157

Name: CVE-2021-38157
Creator: NVD / NIST
Published: 2021-08-06T21:15:06.73+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.12%

Last modified Jun 17, 2026

CVE-2021-38157 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. LeoStream Connection Broker 9.x before 9.0.34.3 allows Unauthenticated Reflected XSS via the /index.pl user parameter. NOTE: This vulnerability only affects products that are no longer supported by the maintainer. EPSS estimates a 1.12% chance of exploitation in the next 30 days.

Description

LeoStream Connection Broker 9.x before 9.0.34.3 allows Unauthenticated Reflected XSS via the /index.pl user parameter. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.12%

62.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Leostream	Connection Broker	>= 9.0.3, < 9.0.34.3

References

https://dgccpa.comThird Party Advisory
https://gist.github.com/erud1te-sec/5c85924cb78ba85af42e0b7b62a5ec91Exploit, Third Party Advisory
https://leostream.comVendor Advisory
https://www.leostream.com/resources-2/product-lifecycle/Vendor Advisory
https://dgccpa.comThird Party Advisory
https://gist.github.com/erud1te-sec/5c85924cb78ba85af42e0b7b62a5ec91Exploit, Third Party Advisory
https://leostream.comVendor Advisory
https://www.leostream.com/resources-2/product-lifecycle/Vendor Advisory

Timeline

Published: Aug 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38157?

How severe is CVE-2021-38157?

CVE-2021-38157 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.12% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38157?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-38157?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST